1900681 has 4 divisors (see below), whose sum is σ = 1911364. Its totient is φ = 1890000.

The previous prime is 1900673. The next prime is 1900687. The reversal of 1900681 is 1860091.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1860091 = 311 ⋅5981.

It can be written as a sum of positive squares in 2 ways, for example, as 210681 + 1690000 = 459^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1900681 - 2³ = 1900673 is a prime.

It is a super-2 number, since 2×1900681² = 7225176527522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1900687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5070 + ... + 5431.

It is an arithmetic number, because the mean of its divisors is an integer number (477841).

2^1900681 is an apocalyptic number.

It is an amenable number.

1900681 is a deficient number, since it is larger than the sum of its proper divisors (10683).

1900681 is a wasteful number, since it uses less digits than its factorization.

1900681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10682.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1900681 is about 1378.6518777414. The cubic root of 1900681 is about 123.8710287559.

The spelling of 1900681 in words is "one million, nine hundred thousand, six hundred eighty-one".